Downloading android source code

I want to download the source code of Android, for which i have followed the steps given in Get source ?(Android Open Source Project)?.
After the initial steps, when i am using repo to download the code, its giving the following error everytime:-shila@shila-desktop:~/mydroid$ repo init -u git://android.git.kernel.org/platform/manifest.git
Getting repo ...
from git://android.git.kernel.org/tools/repo.git
android.git.kernel.org[0: 149.20.20.141]: errno=Connection timed out
android.git.kernel.org[0: 204.152.191.45]: errno=Connection timed out
fatal: unable to connect a socket (Connection timed out)